Vice President Biden will travel to Arizona on Tuesday to attend a memorial for 19 firefighters killed while battling a wildfire in central Arizona.

The White House confirmed Biden's trip on Friday.

The firefighters, part of the special Granite Mountain Hotshots unit, died while battling a forest fire in Yarnell, Ariz., near Phoenix. The firefighters died on Sunday. The fire is being called the deadliest since the fires at the World Trade Center on Sept. 11, 2001.

The fire destroyed 100 houses and ravaged 13 miles of the city.

On Monday, President Obama issued his condolences to the families of the deceased firefighters.

"Michelle and I join all Americans in sending our thoughts and prayers to the families of these brave firefighters and all whose lives have been upended by this terrible tragedy," Obama said in a statement.